Die for spherical articles



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G. P. SIMOND'S.

lDIE POR SPHBRIGAL ARTICLES.

Patented June 9, 1885.

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G. F. SIMONDS.

DIE POR SPHERIGL ARTICLES.

No. 319,756. Patented June 9, 1885.

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2 Sheets-Sheet 2.

PATENT ',FFICE.

Y GEORGE F. SIMONDVS, OF FITOHBURG, MASSACHUSETTS.

DIE FOR SPHERICAL ARTICLES.

SPECIFICATION `forming part of Letters Patent No. 319,756, dated June 9, 1885.

Application filed November 2?., 1884. (No model.) l

To all whom it may concern.'

Be it known that I, GEORGE F. SIMoNDs,

I of Fitchburg, in the county of Worcester and sion is about a semicircle.

State of Massachusetts, have invented new and Improved Dies for Forming Articles to be Used for Ordnance and other Purposes; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a perspective view of a platen and die to form spherical articles. Fig. 2 is a cross-section on the line x a: of Fig. 1. Fig. 3 is a cross-section on theline yyof Fig. 1. Fig. 4 is a section on line z z of Fig. 1. Fig. 5 illustrates a slight modification. Fig. 6 illustrates a modification for rolling conical articles.

My invention relates to dies having raised faces and intended to be used in pairs and moved in opposite directions, to shape articles of metal rolled on their axes between them, and has for its object to provide such dies as will produce articles of a spherical or conical configuration.

My invention consists in dies having raised faces constructed in converging, intersecting, curved, and plane surfaces, and having their working-faces cut away or relieved at desired intervals, whereby slipping of the work and incident twisting are avoided.

My invention also consists in providing the spreading and reducing faces with corrugations, grooves, orother irregularities passing only partially across their surfaces, and in this respect my invention is an improvement on the invention set forth in my application, Serial No. 135,014, filed June 16, 1884.

In order that those skilled in the art may make and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is the body of a die, from which projects the plane curvilinear face, which commences its work at the vanishing point a of the converging forming-surfaces, and finishes its work at the end b. From the point a the central or curved forming-surface c of the die-face gradually deepens andA spreads until it reaches the'point d, where the curved surface in crosssectional dimen- Intersecting the edges of the curved surface c, and converging in the same ratio with the said edges, are two curved forming-surfaces, c e', the difference in the curvatureof the bottom of the die c and the surfaces e e being due to the face being relieved, as hereinafter set out. In turn the surfaces e e are intersected by two outer plane surfaces, t' r,which merge with or intersect two approximately-vertical surfaces, g g', which meet the plane surface q of the die A. The lines of all of these plane surfaces follow the ratio of divergence and elevation of the lines of the central curved surface, all as before stated, having their vanishing lines at a. As any article being reduced becomes `variable in size, some parts of the article will slip on the dies, or the articles will twist. I have demonstrated by experiment that this difficulty may be obviated by relieving or cutting away the forming-faces in a gradually-diverging line, so as to avoid close contact of the articles with the dieexcept at or near where the work is actually being done and change 0f form rapidly progressing.

In sectional views Figs. 2 and 3 Il have shown the bottom of the curved forming-face relieved or cut away at n a', and in the same gures the reducing and spreading surfaces relieved or cut away abruptly in planes shown f at g g. By cutting away the forming andreducing and spreading surfaces as described, I prevent unnecessary friction between the dies and the article in process of manufacture at points where the work has been completed.

In some classes of work to have the best nished condition, I have discovered by actual experiment that it is highly desirable, if not necessary, that the cross-grooves to force and control the revolution of the blank should not extend entirely to the edge of the die where the spreading and reducing surfaces join the forming-surfaces. Therefore I have provided the spreading-surfaces i i with cross-grooves, corrugations, or irregularities() o, extending part way to the edge where said surfaces t' i join the edges of the forming-surfaces. rIhe maximum size of the curved or grooved forming-faces being one-half of the size of the sphere to be rolled, the work starting from the point a, the bevels formed by the intersecting planes e e z' z" force the surplus metal of the bar gradually outwardly, while that ICO portion between the bevels, as the formingfaces of the dies approach each other, is condensed, and is gradually brought to a spherical shape, and finally drops from the end b a perfect sphere.

In Fig. 6 I have illustrated a modification adapted to roll conical articles, but having all the general characteristics of conformation shown in Fig. 1. The central curved groove in this instance is at one side turned at a right angle and brought directly toward and in juncture with the edge line of plane surface i.

The platens and dies are to beused in ainachine described and shown in an application for patent led March 26, 1884, Serial N o. 125,633.

Having thus described my invention, what I l forth.

2. Dies for making articles of circular cross' sectional area, having cross-grooves, corrugations,lor irregularities o o, partially crossing the spreading and reducing faces, substantially as described.

` GEO. F; sIMoNDs.

Witnesses:

R. K. EVANS, H. vA. DOWNE. 

